//-- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2017 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
//++

module.exports = function() {
  var sortOptions = {
    column: "",
    direction: ""
  };
  var SortService = {
    getColumn: function() {
      return sortOptions.column;
    },
    setColumn: function(column) {
      sortOptions.column = column;
    },
    getDirection: function() {
      return sortOptions.direction;
    },
    setDirection: function(direction) {
      var sortDirection = direction;

      if (sortDirection == '-') {
        sortDirection = 'desc';
      }

      if (sortDirection != '' && sortDirection != 'asc' && sortDirection != 'desc') {
        throw new Error("Parameter does not match possible values 'asc' or 'desc'!");
      }

      sortOptions.direction = sortDirection;
    },
    isDescending: function() {
      return sortOptions.direction == 'desc';
    },
    getSortParam: function() {
      var direction = sortOptions.direction;

      if (!direction) {
        direction = 'asc';
      }

      return sortOptions.column + ':' + direction;
    }
  };

  return SortService;
};
